Battery indicator constantly flashing

The LED battery life indicator on the back of my iBook's battery is constantly flashing a single dot. This happens wether or not I have pressed the button on the battery and even when the battery status in the menu bar reads a 50%+ charge (shouldn't it be showing at least 2 dots).
Why won't it stop blinking? Why don't the lights match up with what is shown in the battery status indicator in the menu bar?

How old is the battery, and how long does it last when you run from it? Does it flash even when running on the adapter?
Normally, one flashing light indicates a dead battery. Sometimes when the battery gets old, the status of the battery charge percentage does not read correctly on the iBook's battery status indicator.
Sometimes calibrating the battery will make the battery status indicator reflect a more accurate picture of your battery status.

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